'The Lord of the Rings' star Sean Astin loves his big, blended family. Here’s everything to know about Sean Astin’s mother Patty Duke, his father John Astin and his biological father Michael Tell.

The outcome: Michael Tell was Sean’s father. “If you want to know who I am, John Astin is my father, Michael Tell is my biological father,” Sean told PEOPLE in 2001.

As the son of Patty Duke, Sean Astin came from a famous family, but his background is more complicated than you might think. ... That’s when she met Michael Tell, ...

Sean Astin has appeared in three episodes of The Big Bang Theory Season 12 as Dr. Greg Pemberton: Here is everything you need to know about him. ... rock promoter Michael Tell and actor John Astin.

Sean Astin exclusively told Us Weekly about his new ... himself learned at age 14 that while he had grown up calling John Astin “dad,” his biological father was actually Michael Tell. ...

Tell was briefly married to the late Hollywood star Patty Duke, the mother of his son, Sean Astin, who himself is a well-known actor. The truth about Sean Astin’s father came to light when Astin ...

"If you want to know who I am, John Astin is my father, Michael Tell is my biological father,” Sean told PEOPLE in 2001. He’s close to all three men and considers them all family — Sean also ...